Suppose that P is a critical point of z = f (x, y). Suppose further that at P, the following hold: a² f əx² a² f Əy² -3, -2, 8² f a² f əyəx dady What can we say about point P? ▼ƒ(P) ‡ 0 -1. The function has a local minimum at P The function has a local maximum at P The function has a saddle point at P

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